wake all threads when shut_down! is called
wake all threads when shut_down! is called

rickypai/zookeeper,zk-ruby/zookeeper,songling88/zookeeper,songling88/zookeeper,zk-ruby/zookeeper,rickypai/zookeeper,rickypai/zookeeper,rickypai/zookeeper,songling88/zookeeper,zk-ruby/zookeeper,songling88/zookeeper